I am using Facebook comments on my website but is there any way to get the comments of my website post.
You can retrieve facebook comments for your URL trough the Graph API. Simply make an HTTP GET request to:
In the following example replace <Your token>
with your access token
var xmlHttp = new XMLHttpRequest();
xmlHttp.open( "GET", "https://graph.facebook.com/v2.6/?fields=og_object{comments}&id=https://stackoverflow.com/&access_token=<Your token>", false );
xmlHttp.send( null );
console.log(xmlHttp.responseText);